US3109342A - Plastic collapsible screw fastening device having auxiliary holding means - Google Patents

Plastic collapsible screw fastening device having auxiliary holding means Download PDF

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US3109342A
US3109342A US30503A US3050360A US3109342A US 3109342 A US3109342 A US 3109342A US 30503 A US30503 A US 30503A US 3050360 A US3050360 A US 3050360A US 3109342 A US3109342 A US 3109342A
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sleeve
circular
flange
remote
square
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US30503A
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Disley Aubrey
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George Goodman Ltd
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George Goodman Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B37/00—Nuts or like thread-engaging members
    • F16B37/04—Devices for fastening nuts to surfaces, e.g. sheets, plates
    • F16B37/041—Releasable devices
    • F16B37/043—Releasable devices with snap action
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/955—Locked bolthead or nut
    • Y10S411/965—Locked bolthead or nut with retainer
    • Y10S411/967—Deformable bolthead or nut
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/955—Locked bolthead or nut
    • Y10S411/965—Locked bolthead or nut with retainer
    • Y10S411/97—Resilient retainer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49915—Overedge assembling of seated part
    • Y10T29/4992—Overedge assembling of seated part by flaring inserted cup or tube end
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49938—Radially expanding part in cavity, aperture, or hollow body
    • Y10T29/49943—Riveting

Definitions

  • This invention relates to a screw fastening device of the kind comprising a sleeve adapted to be mounted in a prepared hole in the member to which the fastening device is to be applied, said sleeve having an enlarged head at one end and being so formed that when a screw is driven into the sleeve from this end, the wall of the sleeve which is on the side of said member remote from the head, is caused to bulge outwardly so that ultimately the sleeve is firmly anchored in the said member.
  • Such screw fastening devices are hereinafter referred to as being of the kind specified.
  • the object of the present invention is to provide an improved fastening device of this kind which will be simpler to install than the kind known hitherto and which also possesses other advantages as are referred to hereinafter.
  • a screw fastening device of the kind specified comprising a sleeve which is of generally cylindrical form over the major portion of its length and at one end has a flange projecting radially outwards, the external surface of the portion of the sleeve which is immediately adjacent this flange, being formed to a non-circular cross section so that the sleeve can be mounted non-rotatably in a member having a hole of such shape as to engage non-rotatably with the said portion of the sleeve and with the underneath of the flange of the sleeve engaging the surface of the member surrounding said hole, and the sleeve being further provided with one or more projections on or adjacent said portion of non-circular cross-section and spaced away from said flange, which projections are adapted to engage with said member when the sleeve is mounted in position to prevent the sleeve from being withdrawn.
  • the projections are so formed and located on the sleeve that, when the sleeve is inserted, they engage the surface of the member remote from the flanged end of the sleeve.
  • the member above referred to may, for example, be a single sheet or plate to which something is to be attached by means of a screw and a sleeve in accordance with the invention, or in another case the member may be two or more sheets which are to be secured together and the fastening device of the present invention is particularly advantageous in cases where one side of the said member is inaccessible. Hence the fastening device of the present invention is particularly useful as a blind side fastener.
  • the sleeve from a synthetic resinous material such, for example, as a suitable form of nylon as this enables the sleeve to be easily and economically produced by a die-casting operation and provides a sleeve wall which is readily bulged when a screw is applied and also in this material the aforesaid projections on the sleeve can be readily sprung through the opening in the member to which the sleeve is applied and being resilient 3,139,342? Patented Nov. 5, 1963 will recover their shape and provide the locking function on the blind side of the member.
  • a synthetic resinous material such, for example, as a suitable form of nylon
  • the sleeve provides a fastening with sound deadening properties which is useful in cases where vibration is encountered and secondly it can be used in cases where electrical insulation properties are required and after installation of the sleeve the screw used may be removed leaving a fixed insulating sleeve passing through a partition.
  • the non-circular portion adjacent the flange on the sleeve is of square form and also to facilitate the use of the sleeve, the flange may also be of square form with its sides parallel to the sides of the other square so that when this flange is held in the hand, the square portion of the sleeve can be readily orientated for installation into a corresponding square hole provided in the sheet, plate, or other member to which it is to be applied.
  • the internal passage in the sleeve may, if desired, be provided with a screw thread but I prefer to leave a plain passage as this enables less expensive production and when the sleeve is made in synthetic resinous material a screw can easily cut its own thread when applied.
  • FIGURE 1 is a section through the sleeve shown inserted in a hole and prior to the application of a screw.
  • FIGURE 2 is an underneath plan view on FIGURE 1.
  • FIGURE 3 is a view similar to FIGURE 1 but illustrating the deformation of the sleeve when a screw is applied.
  • FIGURE 4 is an enlarged fragmentary view of one of the projections.
  • FIGURE 5 is a section on the line 5-5 of FIGURE 4, and,
  • FIGURE 6 is a section on the line 66 of FIGURE 4.
  • the sleeve 14 is made from a suitable grade of nylon and over the major portion of its length is of generally cylindrical formation with. a slight taper provided on the external surface at the end 11 of the sleeve remote from the flange 12 so as to provide a lead-in portion to assist in rapid installation of such sleeve into its prepared hole 13 in the member 14 to which it is applied.
  • the sleeve has the outwardly projecting flange 12 which is of square form and immediately adjacent this flange the external surface 15 of the sleeve, for a short portion of its length, is formed to square cross-section, the sides of this square 15 being parallel to the corresponding sides of the flange 12.
  • the square portion 15 of the sleeve is provided with two projections indicated at 16 in FIGURES 1-3 and shown in enlarged detail in FIGURES 4-6.
  • each projection 16 is situated at opposite corners of the square 15, and (referring to FIGURES 4-6) each projection comprises a stem 17 extending from the underneath face of the square 15 in a direction parallel to the axis of the sleeve and a nose '18 projecting outwardly in a direction which is radial to the axis of the sleeve.
  • the stem 17 is spaced outwardly away from the outer wall of the sleeve and that the tip 19 of the nose 18 projects outwardly a greater distance from the axis of the sleeve than the corner of the square portion 15.
  • the distance between the two tips 19 of the projections is greater than the diagonal measurement of the hole 13 in the member 14.
  • each nose 18 is inclined at an acute angle to the axis of the sleeve so that these two surfaces 20 are mutually convergent in the direction towards the entry end ill of the sleeve.
  • the square hole 13 is provided in the plate, sheet, or other member 14 to which the fastening is to be applied, this hole having dimensions to correspond to the square portion 15 on the surface of the sleeve and then the sleeve is pushed through the hole so that the projections 16 on the sleeve are deflected inwardly in passing through the hole 13 in the member 14 and then regain their original form and the noses 18 engage the surface 24 of the member 14 remote from the flange of the sleeve so that when in position the square portion 15 of the sleeve is engaged in the square hole 13 in the member and the sleeve is prevented from being Withdrawn by virtue of the noses of the projections engaging the member 14.
  • the projections 16 on the sleeve prevent any tendency for the sleeve to withdraw during this operation and rotation of the sleeve is prevented by virtue of its square portion 15 engaging in the square hole 13 in the member 14 so that no special tool is required for applying the fastening and a conventional form of screw-driver may be used.
  • the screw may be taken out of the sleeve and reinserted as desired without loss of eficiency of the fastening.
  • the disposition of the projections 16 at the opposed corners of the square 15 has the added advantage that it assists in the initial insertion of the sleeve as it is found that as the sleeve is pushed into the hole 13 and given a slight angular movement the projections 16 will locate themselves at the corners of the square hole and thus greatly facilitate the operation of lining up the square portion 15 with the square hole 13.
  • the sloping surfaces 13 give a lead-in to assist the projections in entering the hole 13.
  • projections 16 shown in the drawings has af-u-rther advantage in practice because, although the length of the stem 17 of the projection is chosen 7 to suit the thickness of sheet 14 with which it is to be used, the thickness may vary from place to place in one sheet and two sheets of supposedly the same guage may have 'diiferent thicknesses due to manufacturing tolerances.
  • the project-ions 16 will still engage behind the sheet and prevent the sleeve from coming out when the screw is being inserted.
  • the projections 16 may not pass right through the hole 13 and the noses 18 will be trapped inside the hole 13 instead of engaging the surface 2
  • due to the particular formation of the projections they will exert a grip upon the wall of the hole 13 and any tendency for the sleeve to withdraw, will only serve to increase this grip so that the projections still function to prevent withdrawal even though the sheet is oversize.
  • the sleeve has a passage 21 which extends right through from end to end but in certain cases, for example where a liquid tight seal is required, it would be advantageous to provide the sleeve with a closed end so that it has a blind hole therein and when applied as a fastening in a manner as above described, the closed end of the sleeve would result in a complete seal being formed around the end of the screw remote from its head.
  • Such an application would be of advantage when applying the fastening device to such things as containers containing corrosive fluid.
  • a screw fastening device comprising a sleeve of deformable material, said sleeve having an axial bore extending from one end at least partially to an end remote from the one end, said bore being enlarged in the region of the one end and of smaller diameter in the region of the remote end, a flange at the one end of the sleeve, a portion of non-circular cross section immediately below the flange for non-rotatable engagement in a similarly shaped hole in a member to which the fastening is applied, the maximum dimension of said portion of noncircular cross section being less than the minimum dimension of said flange, the remaining sleeve portion from the non-circular portion to the remote end of the sleeve-being of circular cross section of less area than that of an end face of the non-circular portion adjacent the circular portion, the diameter of said circular sleeve portion being no greater than the minimum dimension of the non-circular portion, the circular sleeve portion wall immediately adjacent the non-circular portion being
  • a screw fastening device comprising a sleeve of deformable material, said sleeve having an axial bore extending from one end at least partially to an end remote from the one end, said bore being enlarged in the region of the one end and of smaller diameter in the region of the remote end, a flange at the one end of the sleeve, a portion of square cross section immediately below the flange for non-rotatable engagement in a similarly shaped hole in a member to which the fastening is applied, the maximum dimension of said portion of square cross section being less than the minimum dimension of said flange, the remaining sleeve portion from the square portion to the remote end of the sleeve being of circular cross section of less area than that of an end face of the square portion adjacent the circular portion, the diameter of said circular sleeve portion being no greater than the minimum dimension of the non-circular portion, the circular sleeve portion wall immediately adjacent the square portion being thin compared to the circular sleeve portion wall at the

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  • General Engineering & Computer Science (AREA)
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Description

Nov. 5, 1963 A. DISLEY 42 PLASTIC COLLAPSIBLE SCREW FASTENING DEVICE HAVING AUXILIARY HOLDING MEANS Filed May 20, 1960 Inventor wsRE/ J) ISLEY g By AGE VT United States Patent M 3,109,342 PLASTIC COLLAPSlSL'E Sa CREW FASTENlNG DE VICE HAVING AUXHLIARY HGLDENG MEANS Aubrey Disie Knowle, England, assigucr to George Goodman Limited, Birmingham, Warwick, England, a British company Filed May 20, 1%9, Ser. No. 39,593 Claims priority, application Great Britain June 25, 1959 2 Claims. ((11. 85-49) This invention relates to a screw fastening device of the kind comprising a sleeve adapted to be mounted in a prepared hole in the member to which the fastening device is to be applied, said sleeve having an enlarged head at one end and being so formed that when a screw is driven into the sleeve from this end, the wall of the sleeve which is on the side of said member remote from the head, is caused to bulge outwardly so that ultimately the sleeve is firmly anchored in the said member. Such screw fastening devices are hereinafter referred to as being of the kind specified.
Hitherto in this known kind of fastening device the sleeve made of metal has been cylindrical throughout and when being used, the head is held by a tool whilst the screw is being driven to prevent rotation of the sleeve and to prevent the sleeve from being drawn out of the said member due to the axial pull which exists when the wall of the sleeve is being bulged.
The object of the present invention is to provide an improved fastening device of this kind which will be simpler to install than the kind known hitherto and which also possesses other advantages as are referred to hereinafter.
According to the present invention, I provide a screw fastening device of the kind specified comprising a sleeve which is of generally cylindrical form over the major portion of its length and at one end has a flange projecting radially outwards, the external surface of the portion of the sleeve which is immediately adjacent this flange, being formed to a non-circular cross section so that the sleeve can be mounted non-rotatably in a member having a hole of such shape as to engage non-rotatably with the said portion of the sleeve and with the underneath of the flange of the sleeve engaging the surface of the member surrounding said hole, and the sleeve being further provided with one or more projections on or adjacent said portion of non-circular cross-section and spaced away from said flange, which projections are adapted to engage with said member when the sleeve is mounted in position to prevent the sleeve from being withdrawn.
Preferably the projections are so formed and located on the sleeve that, when the sleeve is inserted, they engage the surface of the member remote from the flanged end of the sleeve.
The member above referred to may, for example, be a single sheet or plate to which something is to be attached by means of a screw and a sleeve in accordance with the invention, or in another case the member may be two or more sheets which are to be secured together and the fastening device of the present invention is particularly advantageous in cases where one side of the said member is inaccessible. Hence the fastening device of the present invention is particularly useful as a blind side fastener.
I prefer to make the sleeve from a synthetic resinous material such, for example, as a suitable form of nylon as this enables the sleeve to be easily and economically produced by a die-casting operation and provides a sleeve wall which is readily bulged when a screw is applied and also in this material the aforesaid projections on the sleeve can be readily sprung through the opening in the member to which the sleeve is applied and being resilient 3,139,342? Patented Nov. 5, 1963 will recover their shape and provide the locking function on the blind side of the member.
Further advantages arising from producing the sleeve from synthetic resinous material are that, firstly, it provides a fastening with sound deadening properties which is useful in cases where vibration is encountered and secondly it can be used in cases where electrical insulation properties are required and after installation of the sleeve the screw used may be removed leaving a fixed insulating sleeve passing through a partition.
Conveniently the non-circular portion adjacent the flange on the sleeve is of square form and also to facilitate the use of the sleeve, the flange may also be of square form with its sides parallel to the sides of the other square so that when this flange is held in the hand, the square portion of the sleeve can be readily orientated for installation into a corresponding square hole provided in the sheet, plate, or other member to which it is to be applied.
The internal passage in the sleeve may, if desired, be provided with a screw thread but I prefer to leave a plain passage as this enables less expensive production and when the sleeve is made in synthetic resinous material a screw can easily cut its own thread when applied.
The invention is illustrated in one embodiment in the accompanying drawings wherein:
FIGURE 1 is a section through the sleeve shown inserted in a hole and prior to the application of a screw.
FIGURE 2 is an underneath plan view on FIGURE 1.
FIGURE 3 is a view similar to FIGURE 1 but illustrating the deformation of the sleeve when a screw is applied.
FIGURE 4 is an enlarged fragmentary view of one of the projections.
FIGURE 5 is a section on the line 5-5 of FIGURE 4, and,
FIGURE 6 is a section on the line 66 of FIGURE 4.
In the embodiment of the invention shown in the drawings, the sleeve 14 is made from a suitable grade of nylon and over the major portion of its length is of generally cylindrical formation with. a slight taper provided on the external surface at the end 11 of the sleeve remote from the flange 12 so as to provide a lead-in portion to assist in rapid installation of such sleeve into its prepared hole 13 in the member 14 to which it is applied. At the other end, the sleeve has the outwardly projecting flange 12 which is of square form and immediately adjacent this flange the external surface 15 of the sleeve, for a short portion of its length, is formed to square cross-section, the sides of this square 15 being parallel to the corresponding sides of the flange 12.
The square portion 15 of the sleeve is provided with two projections indicated at 16 in FIGURES 1-3 and shown in enlarged detail in FIGURES 4-6.
As seen best in FIGURE 2, the projections 16 are situated at opposite corners of the square 15, and (referring to FIGURES 4-6) each projection comprises a stem 17 extending from the underneath face of the square 15 in a direction parallel to the axis of the sleeve and a nose '18 projecting outwardly in a direction which is radial to the axis of the sleeve.
it will be observed that the stem 17 is spaced outwardly away from the outer wall of the sleeve and that the tip 19 of the nose 18 projects outwardly a greater distance from the axis of the sleeve than the corner of the square portion 15. Thus the distance between the two tips 19 of the projections, is greater than the diagonal measurement of the hole 13 in the member 14.
v The underside surface 24) of each nose 18 is inclined at an acute angle to the axis of the sleeve so that these two surfaces 20 are mutually convergent in the direction towards the entry end ill of the sleeve. Further,
, through to the flanged end of the sleeve.
In use, the square hole 13 is provided in the plate, sheet, or other member 14 to which the fastening is to be applied, this hole having dimensions to correspond to the square portion 15 on the surface of the sleeve and then the sleeve is pushed through the hole so that the projections 16 on the sleeve are deflected inwardly in passing through the hole 13 in the member 14 and then regain their original form and the noses 18 engage the surface 24 of the member 14 remote from the flange of the sleeve so that when in position the square portion 15 of the sleeve is engaged in the square hole 13 in the member and the sleeve is prevented from being Withdrawn by virtue of the noses of the projections engaging the member 14.
When a screw 25 is applied it cuts its own thread in the smaller diameter portion 22 through the passage of the sleeve and after the head of the screw has made engagement with the flange 12 of the sleeve, further rotation of the screw will draw the tapered end 11 of the sleeve towards the flanged end causing the wall of the sleeve to bulge outwardly (see FIGURE 3) and finally reaching a position where the outwardly bulged wail 26 makes contact with the surface 24 of the member 14 remote from the flange, thus locking the sleeve firmly in position.
The projections 16 on the sleeve prevent any tendency for the sleeve to withdraw during this operation and rotation of the sleeve is prevented by virtue of its square portion 15 engaging in the square hole 13 in the member 14 so that no special tool is required for applying the fastening and a conventional form of screw-driver may be used.
Further the screw may be taken out of the sleeve and reinserted as desired without loss of eficiency of the fastening.
The disposition of the projections 16 at the opposed corners of the square 15 has the added advantage that it assists in the initial insertion of the sleeve as it is found that as the sleeve is pushed into the hole 13 and given a slight angular movement the projections 16 will locate themselves at the corners of the square hole and thus greatly facilitate the operation of lining up the square portion 15 with the square hole 13. The sloping surfaces 13 give a lead-in to assist the projections in entering the hole 13.
The form of projections 16 shown in the drawings has af-u-rther advantage in practice because, although the length of the stem 17 of the projection is chosen 7 to suit the thickness of sheet 14 with which it is to be used, the thickness may vary from place to place in one sheet and two sheets of supposedly the same guage may have 'diiferent thicknesses due to manufacturing tolerances.
Where the sheet is undersize, the project-ions 16 will still engage behind the sheet and prevent the sleeve from coming out when the screw is being inserted. Where the sheet is oversize, the projections 16 may not pass right through the hole 13 and the noses 18 will be trapped inside the hole 13 instead of engaging the surface 2 However, due to the particular formation of the projections they will exert a grip upon the wall of the hole 13 and any tendency for the sleeve to withdraw, will only serve to increase this grip so that the projections still function to prevent withdrawal even though the sheet is oversize.
In the above described embodiment, the sleeve has a passage 21 which extends right through from end to end but in certain cases, for example where a liquid tight seal is required, it would be advantageous to provide the sleeve with a closed end so that it has a blind hole therein and when applied as a fastening in a manner as above described, the closed end of the sleeve would result in a complete seal being formed around the end of the screw remote from its head. Such an application would be of advantage when applying the fastening device to such things as containers containing corrosive fluid.
What I claim then is:
1. A screw fastening device comprising a sleeve of deformable material, said sleeve having an axial bore extending from one end at least partially to an end remote from the one end, said bore being enlarged in the region of the one end and of smaller diameter in the region of the remote end, a flange at the one end of the sleeve, a portion of non-circular cross section immediately below the flange for non-rotatable engagement in a similarly shaped hole in a member to which the fastening is applied, the maximum dimension of said portion of noncircular cross section being less than the minimum dimension of said flange, the remaining sleeve portion from the non-circular portion to the remote end of the sleeve-being of circular cross section of less area than that of an end face of the non-circular portion adjacent the circular portion, the diameter of said circular sleeve portion being no greater than the minimum dimension of the non-circular portion, the circular sleeve portion wall immediately adjacent the non-circular portion being thin compared to the circular sleeve portion wall atthe remote end, and a plurality of circumferentially spaced locking projections integral with the non-circular portion, each locking projection having a stern extending from said end face of the non-circular portion towards the remote end, the stem being parallel to the sleeve axis and spaced from the thin wall of the circular sleeve portion, and a nose projecting radially outwardly from the outer end of the stem beyond the periphery of the non-circular portion.
2. A screw fastening device comprising a sleeve of deformable material, said sleeve having an axial bore extending from one end at least partially to an end remote from the one end, said bore being enlarged in the region of the one end and of smaller diameter in the region of the remote end, a flange at the one end of the sleeve, a portion of square cross section immediately below the flange for non-rotatable engagement in a similarly shaped hole in a member to which the fastening is applied, the maximum dimension of said portion of square cross section being less than the minimum dimension of said flange, the remaining sleeve portion from the square portion to the remote end of the sleeve being of circular cross section of less area than that of an end face of the square portion adjacent the circular portion, the diameter of said circular sleeve portion being no greater than the minimum dimension of the non-circular portion, the circular sleeve portion wall immediately adjacent the square portion being thin compared to the circular sleeve portion wall at the remote end, and two locking projections integral with the square portion, one disposed in each of two opposed corners of the square portion, each locking projection having a stem extending from the square portion towards the remote end, the stern being parallel to the sleeve axis and spaced from the thin wall of the circular sleeve portion, and a nose projecting radially outwardly from the outer end of the stern beyond the periphery of the square portion, the face of the nose towards the remote end being inclined in respect to the sleeve axis and the inclined surfaces of the two noses converging towards said axis in a direction away from the flange.
(References on following page) References Cited in the file of this patent UNITED STATES PATENTS Tinnerman Aug. 5, 1952 6 Rapata May 27, 1958 Edwards May 29, 1959 Shamban et a1 Nov. 17, 1959 Ahlgren July 26, 1960 Bratton Dec. 26, 1961 Cochran Aug. 21, 1962

Claims (1)

1. A SCREW FASTENING DEVICE COMPRISING A SLEEVE OF DEFORMABLE MATERIAL, SAID SLEEVE HAVING AN AXIAL BORE EXTENDING FROM ONE END AT LEAST PARTIALLY TO AN END REMOTE FROM THE ONE END, SAID BORE BEING ENLARGED IN THE REGION OF THE ONE END AND OF SMALLER DIAMETER IN THE REGION OF THE REMOTE END, A FLANGE AT THE ONE END OF THE SLEEVE, A PORTION OF NON-CIRCULAR CROSS SECTION IMMEDIATELY BELOW THE FLANGE FOR NON-ROTATABLE ENGAGEMENT IN A SIMILARLY SHAPED HOLE IN A MEMBER TO WHICH THE FASTENING IS APPLIED, THE MAXIMUM DIMENSION OF SAID PORTION OF NONCIRCULAR CROSS SECTION BEING LESS THAN THE MINIMUM DIMENSION OF SAID FLANGE, THE REMAINING SLEEVE PORTION FROM THE NON-CIRCULAR PORTION TO THE REMOTE END OF THE SLEEVE BEING OF CIRCULAR CROSS SECTION OF LESS AREA THAN THAT OF AN END FACE OF THE NON-CIRCULAR PORTION ADJACENT THE CIRCULAR PORTION, THE DIAMETER OF SAID CIRCULAR SLEEVE PORTION BEING NO GREATER THAN THE MINIMUM DIMENSION OF THE NON-CIRCULAR PORTION, THE CIRCULAR SLEEVE PORTION WALL IMMEDIATELY ADJACENT THE NON-CIRCULAR PORTION BEING THIN COMPARED TO THE CIRCULAR SLEEVE PORTION WALL AT THE REMOTE END, AND A PLURALITY OF CIRCUMFERENTIALLY SPACED LOCKING PROJECTIONS INTEGRAL WITH THE NON-CIRCULAR PORTION, EACH LOCKING PROJECTION HAVING A STEM EXTENDING FROM SAID END FACE OF THE NON-CIRCULAR PORTION TOWARDS THE REMOTE END, THE STEM BEING PARALLEL TO THE SLEEVE AXIS AND SPACED FROM THE THIN WALL OF THE CIRCULAR SLEEVE PORTION, AND A NOSE PROJECTING RADIALLY OUTWARDLY FROM THE OUTER END OF THE STEM BEYOND THE PERIPHERY OF THE NON-CIRCULAR PORTION.
US30503A 1959-06-25 1960-05-20 Plastic collapsible screw fastening device having auxiliary holding means Expired - Lifetime US3109342A (en)

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3342098A (en) * 1965-08-16 1967-09-19 Tinnerman Products Inc Sealed expansion fastener
US3444917A (en) * 1965-06-16 1969-05-20 Tinnerman Products Inc Fastening device
US4182091A (en) * 1977-03-23 1980-01-08 Artur Fischer Mounting arrangement
JPS5958206U (en) * 1982-10-12 1984-04-16 株式会社青山製作所 Synthetic resin grommet
US4531870A (en) * 1980-12-01 1985-07-30 Compagnie De Materiel Et D'equipements Techniques Devices for securing objects to metal sheets accessible from only one side
US5294225A (en) * 1991-11-21 1994-03-15 K.K. Aoyama Seisakusho Synthetic resin grommet
US5511919A (en) * 1992-11-03 1996-04-30 Scalise; Dane C. Locking fastener
WO2008125576A3 (en) * 2007-04-11 2009-04-09 Basf Se Plug for fastening a dashboard

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2181966A (en) * 1937-07-08 1939-12-05 Gen Motors Corp Fastening device
US2358206A (en) * 1941-01-17 1944-09-12 Duffy Mfg Company Attaching device
US2571394A (en) * 1947-06-13 1951-10-16 United Carr Fastener Corp Mounting for fastening members and the like
US2605806A (en) * 1948-07-26 1952-08-05 Tinnerman Products Inc Fastening device
US2836215A (en) * 1954-08-11 1958-05-27 Illinois Tool Works Plastic nut-like fastener with resilient wings
US2887926A (en) * 1956-07-30 1959-05-26 Illinois Tool Works Plastic fastening device with foldable shank
US2912712A (en) * 1955-10-31 1959-11-17 William S Shamban One-piece grommet
US2946612A (en) * 1958-02-24 1960-07-26 Amerock Corp Self-alining catch
US3014563A (en) * 1957-06-12 1961-12-26 Gen Motors Corp Anchor assembly
US3050097A (en) * 1959-10-22 1962-08-21 United Carr Fastener Corp Snap-in bolt retainer

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2181966A (en) * 1937-07-08 1939-12-05 Gen Motors Corp Fastening device
US2358206A (en) * 1941-01-17 1944-09-12 Duffy Mfg Company Attaching device
US2571394A (en) * 1947-06-13 1951-10-16 United Carr Fastener Corp Mounting for fastening members and the like
US2605806A (en) * 1948-07-26 1952-08-05 Tinnerman Products Inc Fastening device
US2836215A (en) * 1954-08-11 1958-05-27 Illinois Tool Works Plastic nut-like fastener with resilient wings
US2912712A (en) * 1955-10-31 1959-11-17 William S Shamban One-piece grommet
US2887926A (en) * 1956-07-30 1959-05-26 Illinois Tool Works Plastic fastening device with foldable shank
US3014563A (en) * 1957-06-12 1961-12-26 Gen Motors Corp Anchor assembly
US2946612A (en) * 1958-02-24 1960-07-26 Amerock Corp Self-alining catch
US3050097A (en) * 1959-10-22 1962-08-21 United Carr Fastener Corp Snap-in bolt retainer

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444917A (en) * 1965-06-16 1969-05-20 Tinnerman Products Inc Fastening device
US3342098A (en) * 1965-08-16 1967-09-19 Tinnerman Products Inc Sealed expansion fastener
US4182091A (en) * 1977-03-23 1980-01-08 Artur Fischer Mounting arrangement
US4531870A (en) * 1980-12-01 1985-07-30 Compagnie De Materiel Et D'equipements Techniques Devices for securing objects to metal sheets accessible from only one side
JPS5958206U (en) * 1982-10-12 1984-04-16 株式会社青山製作所 Synthetic resin grommet
JPS6146245Y2 (en) * 1982-10-12 1986-12-26
US5294225A (en) * 1991-11-21 1994-03-15 K.K. Aoyama Seisakusho Synthetic resin grommet
US5511919A (en) * 1992-11-03 1996-04-30 Scalise; Dane C. Locking fastener
WO2008125576A3 (en) * 2007-04-11 2009-04-09 Basf Se Plug for fastening a dashboard

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